Well, they had Dillinger surrounded and was all ready to shoot him when he come, but another bunch of folks come out ahead, so they just shot them instead.

I once heard former Special Agent G. Gordon Liddy give a talk in which he recounted his extensive FBI training back in the fifties. Agents needed to do the right thing automatically under pressure. They spent a lot of time on the range shooting (or not shooting, as appropriate) popup targets. The Number One Rule was "Don't embarrass the bureau!". And just about the most bureau-embarrassing thing you could do was to drill a "citizen".